1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/kernel/cpu/sh3/clock-sh7705.c 4 * 5 * SH7705 support for the clock framework 6 * 7 * Copyright (C) 2005 Paul Mundt 8 * 9 * FRQCR parsing hacked out of arch/sh/kernel/time.c 10 * 11 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka 12 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> 13 * Copyright (C) 2002, 2003, 2004 Paul Mundt 14 * Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org> 15 */ 16 #include <linux/init.h> 17 #include <linux/kernel.h> 18 #include <asm/clock.h> 19 #include <asm/freq.h> 20 #include <asm/io.h> 21 22 /* 23 * SH7705 uses the same divisors as the generic SH-3 case, it's just the 24 * FRQCR layout that is a bit different.. 25 */ 26 static int stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 }; 27 static int ifc_divisors[] = { 1, 2, 3, 4, 1, 1, 1, 1 }; 28 static int pfc_divisors[] = { 1, 2, 3, 4, 6, 1, 1, 1 }; 29 30 static void master_clk_init(struct clk *clk) 31 { 32 clk->rate *= pfc_divisors[__raw_readw(FRQCR) & 0x0003]; 33 } 34 35 static struct sh_clk_ops sh7705_master_clk_ops = { 36 .init = master_clk_init, 37 }; 38 39 static unsigned long module_clk_recalc(struct clk *clk) 40 { 41 int idx = __raw_readw(FRQCR) & 0x0003; 42 return clk->parent->rate / pfc_divisors[idx]; 43 } 44 45 static struct sh_clk_ops sh7705_module_clk_ops = { 46 .recalc = module_clk_recalc, 47 }; 48 49 static unsigned long bus_clk_recalc(struct clk *clk) 50 { 51 int idx = (__raw_readw(FRQCR) & 0x0300) >> 8; 52 return clk->parent->rate / stc_multipliers[idx]; 53 } 54 55 static struct sh_clk_ops sh7705_bus_clk_ops = { 56 .recalc = bus_clk_recalc, 57 }; 58 59 static unsigned long cpu_clk_recalc(struct clk *clk) 60 { 61 int idx = (__raw_readw(FRQCR) & 0x0030) >> 4; 62 return clk->parent->rate / ifc_divisors[idx]; 63 } 64 65 static struct sh_clk_ops sh7705_cpu_clk_ops = { 66 .recalc = cpu_clk_recalc, 67 }; 68 69 static struct sh_clk_ops *sh7705_clk_ops[] = { 70 &sh7705_master_clk_ops, 71 &sh7705_module_clk_ops, 72 &sh7705_bus_clk_ops, 73 &sh7705_cpu_clk_ops, 74 }; 75 76 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) 77 { 78 if (idx < ARRAY_SIZE(sh7705_clk_ops)) 79 *ops = sh7705_clk_ops[idx]; 80 } 81 82